I tried to find it by Googling it in a couple of forms and found nothing. I was looking at it to see if it was some kind of commercial entity. For him to have put it in the location, though, it must have some significance. I'm sure you know him better than I, but I don't think he's one of those who puts something like that in without having some thought about it.
Tell you what, though I'll DM him and ask, and maybe we can decide after we get his answer?
I will ask him next time around. He's answered my query about PNYC and said it's "shorthand" for Parque Nacional Yanachaga Chemillén which we have in Opus in English as Yanachaga Chemillen National Park. I will edit this with the English version in the article caption and link it. He has edited his upload information to take the shorthand out.